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In pregnant stroke-prone spontaneously hypertensive rats, salt-loading causes symptoms similar to those of human preeclampsia, such as hypertension and proteinuria. To seek evidence of the therapeutic potential in preeclampsia of antithrombin III (AT III), which is a serine protease inhibitor active on various enzymes of the coagulation cascade, we examined the effect of consecutive treatment with AT III on hypertension and proteinuria in this animal model. Salt-loading (2% NaCl diet) caused a significant elevation of systolic blood pressure on day 15-17 and of urinary protein excretion on day 17-19 of gestation, as compared with animals fed a normal diet. AT III, administered i.v. at a dose of 60 or 300 U/kg/d for 10 d from day 9-11 to 18-20, attenuated these pathological changes in a dose-dependent manner. Histological examination of the kidney revealed that AT III prevented the occurrence of arteriosclerosis and thickening of the capillary basement membrane. However, the pathological changes induced by salt-loading were not attributable to activation of the blood coagulation system. These results demonstrate that AT III has preventive action against salt-induced hypertension and proteinuria in pregnancy through a mechanism largely independent of its anticoagulant action. AT III may thus be beneficial for the treatment of clinical symptoms of preeclampsia.

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Antithrombin III Prevents Blood Pressure Elevation and Proteinuria Induced by High Salt Intake in Pregnant Stroke-Prone Spontaneously Hypertensive Rats.